Bently Nevada 3500/44M Redundant configuration relay output device

Description

3500/44M SIL capability certification is based on the mode of operation of the system. The
mode of operation is based on the relationship between the dangerous condition
(the demand) and the diagnostic testing. The BN Hazardous Gas Protection
System is certified based on a low demand mode of operation. In a low demand
mode of operation, a dangerous condition is expected very infrequently. IEC
61508 states that the frequency of demand for low demand operation is no
greater than one per year and no greater than twice during the proof-test
interval.

The 3500/44M 1-channel BN system has a Hardware Fault Tolerance (HFT) of zero (0). That
means for the simplex architecture no faults (0) can be tolerated for the system to
still provide the required safety coverage.
Per table 3 in IEC 61508-02 (and replicated here in Table 11-3), a Safe Failure
Fraction (SFF) of 90 to 99% is required for SIL 2.

*Note: The BN system is considered a type B subsystem because it
involves a microprocessor.
Thus, the safety structure, tests, and diagnostics must be designed such
that at least 90% of all failure modes are detected and/or result in a safe
state.

These values are applicable to the entire safety loop, including the BN 3500
Hazardous Gas Protection System as well as all other controllers and actuators
that are supplied by the user and that are part of the safety instrumented
function (SIF).
As shown in the Table 11-4, in order for your application to satisfy a SIL2
requirement, the probability of dangerous failure for the entire safety
instrumented function must be in the SIL2 range, that is, between 10-2 and 10-3.

Table 11-5 shows the failure rates for the BN components that can be used to
make up a subsystem. These failure rates were calculated by a hardware
assessment in the form of a Failure Modes, Effects, and Diagnostic Analysis
(FMEDA) of the Bently Nevada system. A user of the 3500 BN Hazardous Gas
Protection System can utilize these failure rates in a probabilistic model of a
safety instrumented function (SIF) to determine suitability in part for safety
instrumented system (SIS) usage in a particular safety integrity level (SIL).

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135785-01 3500/93 Display Unit, non backlighted
135785-02 3500/93 Display Unit, back-lighted
137412-01 3500/93 Manual
135799-01 3500/93 Display Interface Module
135799-02 3500/93 Display Interface Module
(use with A05 option only)
135813-01 3500/93 Display Interface I/O
Module
136634-0010-01 10 Foot (3 metres) Cable (PVC)
136634-0050-01 50 Foot (15 metres) Cable (PVC)
136634-0050-02 50 Foot (15 metres) Cable
(Teflon? )
136634-0100-01 100 Foot (30 metres) Cable (PVC)
136634-0100-02 100 Foot (30 metres) Cable
(Teflon? )
130121-02-01 500 Foot (152 metres) Extension
Cable (PVC)
130121-02-02 500 Foot (152 metres) Extension
Cable (Teflon? )
02200271 External Power Supply for 115 Vac
02200272 External Power Supply for 230 Vac
138227-01 Cable Adapter
146085-01 Power Cable
137224-01 System Mounting Assembly
(sheet metal for A01 & A05
options)
04309007 4-40 X 0.63 Phillips head screw for
System Mounting Assembly, 4 are
required